Gilgamesh raises an eyebrow at Satsuki at her reply feeling slightly incredulous. "...Because I was their king?" was his rather patronizing response. He speaks again a few seconds later though to clarify, "I was designated king through the gods who made me so I have been given rule over them because of such."

He has a more dour look though as he thinks on the last part of your statement. "Last experience...Was being dragged through a war as a Servant to a Master, that is a summoned hero to a magus, in order to fight to obtain a relic said to grant any wish. I need not a wish personally, but merely the fact that it was mine to begin with is enough to make me willing to fight."